Air treatment system filter



FIG. 1 is a front perspective view of the air treatment system filter of the new design;

FIG. 2 is a front elevational view, the back side being a mirror image thereof;

FIG. 3 is a right side elevational view, the left side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for air treatment system filter, as shown and described. 